The invention discloses an infrared interferogram reconstruction method, wherein a laser interference signal and an infrared interference signal which are generated through light splitting by a Michelson interferometer exist. The method comprises the steps of simultaneously performing oversampling on the laser interference signal and the infrared interference signal by means of the same sampling rate; according to the requirement in an actual condition, setting the same interpolation factor for performing interpolation operation on two signals after oversampling; acquiring laser zero-crossing information from the laser interference signal after interpolation, and performing resampling on the infrared interference signal after interpolation according to the laser zero-crossing information, and finally obtaining an infrared interferogram with equal light path difference after reconstruction. According to the method of the invention, sampling and interpolation operation on the two signal are performed simultaneously, thereby ensuring time consistency and simplifying extraction to the zero-crossing information of the laser interference signal. The method according to the invention reduces data processing complexity.